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Chemistry: explore STEM content (page 8 of 47) · openstem

All fields Software Mathematics Physics Chemistry Biology Engineering Astronomy Environmental Other Chemistry Chemistry groups

Explore STEM Content

Search the community's STEM library — free to study, yours to make your own.

Chemistry

Reactions, bonding and organic chemistry on openstem — flashcards, notes, quizzes and molecule structures shared by the community. Study free, or clone into your library.

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MoleculeCC(=O)C

Chemistry

Acetone / propan-2-one ((CH₃)₂C=O)

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Acetone / propan-2-one ((CH₃)₂C=O)

Collection4 items

01Chemistry · L5 · Crystal Field Stabilization Energy

02Chemistry · L5 · Crystal Field Stabilization Energy: The Arithmetic and Its Payoff

03Chemistry · L5 · Double-Humped Hydration Enthalpy Trend Across First-Row M²⁺ Ions

+1 more

Chemistry

Chemistry · L5 · Crystal Field Stabilization Energy

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Chemistry · L5 · Crystal Field Stabilization Energy

Note~932 words · 5 min

Periodic anomalies: diagonal relationships, lanthanide contraction, and the inert-pair effect The four core trends — atomic radius, ionization energy, electronegativity, metallic character — and the ionization-energy dips at Be→B and N→O ex

Chemistry

Chemistry · L4 · Periodic Anomalies

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Chemistry · L4 · Periodic Anomalies

Note~712 words · 4 min

Lewis acids and bases: the electron-pair framework The Brønsted-Lowry theory defines acids and bases by proton transfer, but many important reactions involve no proton at all. The Lewis theory reframes acid-base chemistry in terms of electr

Chemistry

Chemistry · L4 · Lewis Acids and Bases

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Chemistry · L4 · Lewis Acids and Bases

Quiz10 questions

How many moles of CO₂ are produced by burning 44 g of propane (C₃H₈, M = 44 g/mol) in excess oxygen? (C₃H₈ + 5O₂ → 3CO₂ + 4H₂O)

A1 molB2 molC3 molD5 mol

Chemistry

Chemistry · L4 · Stoichiometry & Equilibrium — 10 Q

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Chemistry · L4 · Stoichiometry & Equilibrium — 10 Q

Quiz5 questions

What is a mixture?

AA brand new substance made from heating thingsBTwo or more things stirred together without becoming something newCOnly something you can see throughDA liquid only

Chemistry

Chemistry · L1 · Mixtures vs. Solutions

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Chemistry · L1 · Mixtures vs. Solutions

Flashcards11 cards

What three metals act as catalysts inside a car's catalytic converter?1 / 11

Platinum, palladium and rhodium.

Chemistry

Chemistry · L3 · Catalysts in Industry

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Chemistry · L3 · Catalysts in Industry

Flashcards8 cards

What is an endothermic reaction?1 / 8

A reaction that absorbs energy from its surroundings, usually as heat. The reaction mixture and container get colder.

Chemistry

Chemistry · L2 · Endothermic Reactions & Spotting the Difference

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Chemistry · L2 · Endothermic Reactions & Spotting the Difference

Quiz6 questions

What distinguishes CuAAC from the uncatalyzed thermal Huisgen azide–alkyne cycloaddition?

ACuAAC requires UV light to proceed; the Huisgen reaction does notBCuAAC is fast and highly regioselective for the 1,4-triazole; the uncatalyzed reaction is slow and gives a roughly 1:1 mixture of 1,4- and 1,5-regioisomersCCuAAC forms a six-membered ring, while the Huisgen reaction forms a five-membered ringDCuAAC only works with internal (disubstituted) alkynes, never terminal ones

Chemistry

Chemistry · L5 · Click Chemistry and Bioorthogonal Labeling

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Chemistry · L5 · Click Chemistry and Bioorthogonal Labeling

Quiz6 questions

What determines an element's position in the periodic table?

AThe colour of the elementBIts atomic number — the number of protonsCThe year it was discoveredDHow heavy a single atom feels

Chemistry

Chemistry · L2 · Periodic Table Basics

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Chemistry · L2 · Periodic Table Basics

Plot1 plot

Chemistry

Chemistry · L4 · Relative effusion rate vs molar mass (Graham's Law)

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Chemistry · L4 · Relative effusion rate vs molar mass (Graham's Law)

MoleculeFB(F)F

Chemistry

Chemistry · L3 · Boron trifluoride (BF₃)

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Chemistry · L3 · Boron trifluoride (BF₃)

Collection3 items

01Chemistry · L5 · Zeolite Catalysis

02Chemistry · L5 · Zeolite Catalysis

03Chemistry · L5 · Zeolite Catalysis

Chemistry

Chemistry · L5 · Zeolite Catalysis

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Chemistry · L5 · Zeolite Catalysis

Collection11 items

01Chemistry · L2 · Atoms and Molecules

02Chemistry · L2 · Physical vs Chemical Change

03Chemistry · L2 · Acids and Bases

+8 more

Chemistry

Chemistry · L2 · Atoms, Mixtures & Reactions

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Chemistry · L2 · Atoms, Mixtures & Reactions

Flowchart13 objects

Chemistry

Chemistry · L2 · Everyday Density Comparisons

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Chemistry · L2 · Everyday Density Comparisons

Collection5 items

01Chemistry · L3 · Avogadro's Law and Molar Gas Volume

02Chemistry · L3 · Avogadro's Law and Molar Gas Volume

03Chemistry · L3 · Avogadro's Law: Same Volume, Same Moles

+2 more

Chemistry

Chemistry · L3 · Avogadro's Law and Molar Gas Volume

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Chemistry · L3 · Avogadro's Law and Molar Gas Volume

Flowchart7 objects

Chemistry

Chemistry · L1 · Salt on an Icy Sidewalk

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Chemistry · L1 · Salt on an Icy Sidewalk

Flowchart9 objects

Chemistry

Chemistry · L1 · Still, Stirred, or Warm?

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Chemistry · L1 · Still, Stirred, or Warm?

Quiz6 questions

Using the criss-cross method on Ca²⁺ and NO3⁻, what is the correct formula for calcium nitrate?

ACaNO3BCa(NO3)2CCa2NO3DCa(NO3)3

Chemistry

Chemistry · L3 · Naming and Writing Ionic Formulae

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Chemistry · L3 · Naming and Writing Ionic Formulae

Flashcards6 cards

What equation connects the standard free energy change ΔG° to the equilibrium constant K?1 / 6

— where R = 8.314 J mol⁻¹ K⁻¹ and T is in kelvin. This is the bridge between thermodynamics (ΔG°, a single measured or calculated number) and equilibrium (K, the ratio of product to reactant activities at equilibrium).

Chemistry

Chemistry · L4 · Gibbs Free Energy — ΔG° and the Equilibrium Constant K

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Chemistry · L4 · Gibbs Free Energy — ΔG° and the Equilibrium Constant K

Collection4 items

01Chemistry · L4 · Lewis Acids and Bases

02Chemistry · L4 · Lewis Acids and Bases

03Chemistry · L4 · Brønsted-Lowry as a subset of Lewis acid-base theory

+1 more

Chemistry

Chemistry · L4 · Lewis Acids and Bases

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Chemistry · L4 · Lewis Acids and Bases

Flashcards11 cards

What is different about the gas inside a helium balloon, compared to the air all around us?1 / 11

The helium gas is packed together much more loosely than the air around it — that is what makes the whole balloon float.

Chemistry

Chemistry · L1 · Why Helium Balloons Float Up

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Chemistry · L1 · Why Helium Balloons Float Up

Collection4 items

01Chemistry · L5 · Computational Docking & Drug Design

02Chemistry · L5 · Computational Docking & Drug Design

03Chemistry · L5 · Free-Energy Perturbation Alchemical Pathway

+1 more

Chemistry

Chemistry · L5 · Computational Docking & Drug Design

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Chemistry · L5 · Computational Docking & Drug Design

Collection4 items

01Chemistry · L4 · Instrumental Chromatography — HPLC and GC

02Chemistry · L4 · Instrumental Chromatography — HPLC and GC

03Chemistry · L4 · Gas Chromatography (GC) Pipeline

+1 more

Chemistry

Chemistry · L4 · Instrumental Chromatography — HPLC and GC

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Chemistry · L4 · Instrumental Chromatography — HPLC and GC

Flashcards10 cards

Why does conventional free-radical polymerization produce a broad molecular-weight distribution (high dispersity, PDI)?1 / 10

Initiator molecules decompose randomly throughout the reaction, so individual chains initiate at staggered times — some start growing early, some start late. Propagating radicals also terminate irreversibly and at random (by coupling or disproportionation) whenever two radical chain ends happen to collide. Because both initiation and termination are random events spread across the whole reaction time, chains end up wildly different lengths, giving a broad, high-PDI molecular-weight distribution.

Chemistry

Chemistry · L5 · Controlled and Living Polymerization

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Chemistry · L5 · Controlled and Living Polymerization

Flowchart5 objects

Chemistry

Chemistry · L3 · Diluting a Solution

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Chemistry · L3 · Diluting a Solution

Note~425 words · 2 min

Watching pH climb In a titration you add a solution of known concentration (the titrant, here a strong base) drop by drop from a burette into a flask holding a fixed volume of the unknown acid. Plotting the flask's pH against the volume of

Chemistry

Chemistry · L3 · Reading a Titration Curve

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Chemistry · L3 · Reading a Titration Curve

Plot1 plot · 2 params

Chemistry

Chemistry · L3 · Acid–Base Titration Curve

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Chemistry · L3 · Acid–Base Titration Curve

Flashcards12 cards

What causes the small M+1 peak in a mass spectrum, and roughly how big is it?1 / 12

The M+1 peak arises mainly from the natural abundance of heavier isotopes, dominated by ¹³C (~1.1% of all carbon atoms, versus ~98.9% ¹²C). Each carbon in the molecule contributes about 1.1% to the M+1 peak's height relative to M, so for a compound with N carbon atoms, the M+1 height ≈ N × 1.1% of the M peak height.

Chemistry

Chemistry · L5 · Advanced Mass Spectrometry

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Chemistry · L5 · Advanced Mass Spectrometry

Quiz6 questions

Which of these best describes what entropy measures?

AThe total mass of a systemBHow spread out or disordered energy and matter areCThe temperature of a system in degrees CelsiusDThe exact amount of heat a reaction releases

Chemistry

Chemistry · L3 · Entropy and the Second Law Quiz

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Chemistry · L3 · Entropy and the Second Law Quiz

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